/*
 * Copyright (c) 2011-2014 Pivotal Software, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.camunda.bpm.extension.reactor.projectreactor.io.codec.json;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.camunda.bpm.extension.reactor.projectreactor.io.codec.SerializationCodec;

import java.io.IOException;
import java.util.function.Consumer;
import java.util.function.Function;

/**
 * @author Jon Brisbin
 */
public class JacksonJsonCodec<IN, OUT> extends SerializationCodec<ObjectMapper, IN, OUT> {

  public JacksonJsonCodec() {
    this(new ObjectMapper());
  }

  public JacksonJsonCodec(ObjectMapper engine) {
    super(engine, true);
  }

  @Override
  protected Function<byte[], IN> deserializer(final ObjectMapper engine,
                                              final Class<IN> type,
                                              final Consumer<IN> next) {
    return new Function<byte[], IN>() {
      @Override
      public IN apply(byte[] bytes) {
        try {
          IN o = engine.readValue(bytes, type);
          if (null != next) {
            next.accept(o);
            return null;
          } else {
            return o;
          }
        } catch (IOException e) {
          throw new IllegalStateException(e.getMessage(), e);
        }
      }
    };
  }

  @Override
  protected Function<OUT, byte[]> serializer(final ObjectMapper engine) {
    return new Function<OUT, byte[]>() {
      @Override
      public byte[] apply(OUT o) {
        try {
          return engine.writeValueAsBytes(o);
        } catch (JsonProcessingException e) {
          throw new IllegalArgumentException(e.getMessage(), e);
        }
      }
    };
  }

}
